Alright, here is how I see it. Alis is going to come in naked/covered in a towel and get offered to join. She is going to say yes and approach, but Sean is going to pull her away and either they have sexual tension and continue diving, or they actually kiss or something. I am leaning on, they continue diving.

You're telling me that they cover being covered in uncovered horny girls, but the course on being covered in uncovered horny girls isn't covered unless they expect you to be covered in the course of the course?